AN4346 datasheet(17/33 Pages) STMICROELECTRONICS

No. de pieza	AN4346

Descripción Electrónicos	10 W wide range - high power factor - isolated LED driver using HVLED815PF

PDF	33 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

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AN4346

Measurement results

2.10

Overvoltage protection in no load condition

In the EVLHVLED815W10F demonstration board the OVP protection has been set at 30

VDC typ.

Regulated output voltage during no load condition can be fixed by selecting properly RDMG

and RFB (see the HVLED815PF datasheet) by Equation 1.

Equation 1

OVP voltage vs. input mains is represented in Figure 15.

Figure 15. OVP voltage vs. input mains

Waveforms of LED driver behavior are shown in Section 3: Electrical waveform on page 22.

2.11

Thermal measurements

To check reliability of design, the thermal maps have been checked with an IR camera.

The LED driver has been stressed at the nominal LED load number (POUT = 10 W) all over

the input mains voltage range. Only the minimum, maximum voltage range and the two

nominal mains voltage 100/50 Hz and 230/50 Hz have been reported.

VOUT

Naux

------------

RDMG

RFB

---------------- VREF VREF

Naux

------------

------

91k



16k



---------------

 2.51V 2.51V 42

------

30V



AN4346 Datasheet(PDF) 17 Page - STMicroelectronics